1
2
3
4
5
6
7
8#include <linux/platform_device.h>
9#include <linux/netdevice.h>
10#include <linux/phy.h>
11#include <linux/phy_fixed.h>
12#include <linux/export.h>
13#include <linux/ethtool.h>
14#include <linux/workqueue.h>
15#include <linux/module.h>
16#include <linux/if_bridge.h>
17#include <linux/dsa/loop.h>
18#include <net/dsa.h>
19
20#include "dsa_loop.h"
21
22static struct dsa_loop_mib_entry dsa_loop_mibs[] = {
23 [DSA_LOOP_PHY_READ_OK] = { "phy_read_ok", },
24 [DSA_LOOP_PHY_READ_ERR] = { "phy_read_err", },
25 [DSA_LOOP_PHY_WRITE_OK] = { "phy_write_ok", },
26 [DSA_LOOP_PHY_WRITE_ERR] = { "phy_write_err", },
27};
28
29static struct phy_device *phydevs[PHY_MAX_ADDR];
30
31enum dsa_loop_devlink_resource_id {
32 DSA_LOOP_DEVLINK_PARAM_ID_VTU,
33};
34
35static u64 dsa_loop_devlink_vtu_get(void *priv)
36{
37 struct dsa_loop_priv *ps = priv;
38 unsigned int i, count = 0;
39 struct dsa_loop_vlan *vl;
40
41 for (i = 0; i < ARRAY_SIZE(ps->vlans); i++) {
42 vl = &ps->vlans[i];
43 if (vl->members)
44 count++;
45 }
46
47 return count;
48}
49
50static int dsa_loop_setup_devlink_resources(struct dsa_switch *ds)
51{
52 struct devlink_resource_size_params size_params;
53 struct dsa_loop_priv *ps = ds->priv;
54 int err;
55
56 devlink_resource_size_params_init(&size_params, ARRAY_SIZE(ps->vlans),
57 ARRAY_SIZE(ps->vlans),
58 1, DEVLINK_RESOURCE_UNIT_ENTRY);
59
60 err = dsa_devlink_resource_register(ds, "VTU", ARRAY_SIZE(ps->vlans),
61 DSA_LOOP_DEVLINK_PARAM_ID_VTU,
62 DEVLINK_RESOURCE_ID_PARENT_TOP,
63 &size_params);
64 if (err)
65 goto out;
66
67 dsa_devlink_resource_occ_get_register(ds,
68 DSA_LOOP_DEVLINK_PARAM_ID_VTU,
69 dsa_loop_devlink_vtu_get, ps);
70
71 return 0;
72
73out:
74 dsa_devlink_resources_unregister(ds);
75 return err;
76}
77
78static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds,
79 int port,
80 enum dsa_tag_protocol mp)
81{
82 dev_dbg(ds->dev, "%s: port: %d\n", __func__, port);
83
84 return DSA_TAG_PROTO_NONE;
85}
86
87static int dsa_loop_setup(struct dsa_switch *ds)
88{
89 struct dsa_loop_priv *ps = ds->priv;
90 unsigned int i;
91
92 for (i = 0; i < ds->num_ports; i++)
93 memcpy(ps->ports[i].mib, dsa_loop_mibs,
94 sizeof(dsa_loop_mibs));
95
96 dev_dbg(ds->dev, "%s\n", __func__);
97
98 return dsa_loop_setup_devlink_resources(ds);
99}
100
101static void dsa_loop_teardown(struct dsa_switch *ds)
102{
103 dsa_devlink_resources_unregister(ds);
104}
105
106static int dsa_loop_get_sset_count(struct dsa_switch *ds, int port, int sset)
107{
108 if (sset != ETH_SS_STATS && sset != ETH_SS_PHY_STATS)
109 return 0;
110
111 return __DSA_LOOP_CNT_MAX;
112}
113
114static void dsa_loop_get_strings(struct dsa_switch *ds, int port,
115 u32 stringset, uint8_t *data)
116{
117 struct dsa_loop_priv *ps = ds->priv;
118 unsigned int i;
119
120 if (stringset != ETH_SS_STATS && stringset != ETH_SS_PHY_STATS)
121 return;
122
123 for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
124 memcpy(data + i * ETH_GSTRING_LEN,
125 ps->ports[port].mib[i].name, ETH_GSTRING_LEN);
126}
127
128static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port,
129 uint64_t *data)
130{
131 struct dsa_loop_priv *ps = ds->priv;
132 unsigned int i;
133
134 for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
135 data[i] = ps->ports[port].mib[i].val;
136}
137
138static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
139{
140 struct dsa_loop_priv *ps = ds->priv;
141 struct mii_bus *bus = ps->bus;
142 int ret;
143
144 ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);
145 if (ret < 0)
146 ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;
147 else
148 ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;
149
150 return ret;
151}
152
153static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
154 int regnum, u16 value)
155{
156 struct dsa_loop_priv *ps = ds->priv;
157 struct mii_bus *bus = ps->bus;
158 int ret;
159
160 ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
161 if (ret < 0)
162 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;
163 else
164 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;
165
166 return ret;
167}
168
169static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
170 struct net_device *bridge)
171{
172 dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
173 __func__, port, bridge->name);
174
175 return 0;
176}
177
178static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
179 struct net_device *bridge)
180{
181 dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
182 __func__, port, bridge->name);
183}
184
185static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
186 u8 state)
187{
188 dev_dbg(ds->dev, "%s: port: %d, state: %d\n",
189 __func__, port, state);
190}
191
192static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
193 bool vlan_filtering,
194 struct netlink_ext_ack *extack)
195{
196 dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n",
197 __func__, port, vlan_filtering);
198
199 return 0;
200}
201
202static int dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
203 const struct switchdev_obj_port_vlan *vlan,
204 struct netlink_ext_ack *extack)
205{
206 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
207 bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
208 struct dsa_loop_priv *ps = ds->priv;
209 struct mii_bus *bus = ps->bus;
210 struct dsa_loop_vlan *vl;
211
212 if (vlan->vid >= ARRAY_SIZE(ps->vlans))
213 return -ERANGE;
214
215
216 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
217
218 vl = &ps->vlans[vlan->vid];
219
220 vl->members |= BIT(port);
221 if (untagged)
222 vl->untagged |= BIT(port);
223 else
224 vl->untagged &= ~BIT(port);
225
226 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
227 __func__, port, vlan->vid, untagged ? "un" : "", pvid);
228
229 if (pvid)
230 ps->ports[port].pvid = vlan->vid;
231
232 return 0;
233}
234
235static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
236 const struct switchdev_obj_port_vlan *vlan)
237{
238 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
239 struct dsa_loop_priv *ps = ds->priv;
240 u16 pvid = ps->ports[port].pvid;
241 struct mii_bus *bus = ps->bus;
242 struct dsa_loop_vlan *vl;
243
244
245 mdiobus_read(bus, ps->port_base + port, MII_BMSR);
246
247 vl = &ps->vlans[vlan->vid];
248
249 vl->members &= ~BIT(port);
250 if (untagged)
251 vl->untagged &= ~BIT(port);
252
253 if (pvid == vlan->vid)
254 pvid = 1;
255
256 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
257 __func__, port, vlan->vid, untagged ? "un" : "", pvid);
258 ps->ports[port].pvid = pvid;
259
260 return 0;
261}
262
263static int dsa_loop_port_change_mtu(struct dsa_switch *ds, int port,
264 int new_mtu)
265{
266 struct dsa_loop_priv *priv = ds->priv;
267
268 priv->ports[port].mtu = new_mtu;
269
270 return 0;
271}
272
273static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port)
274{
275 return ETH_MAX_MTU;
276}
277
278static const struct dsa_switch_ops dsa_loop_driver = {
279 .get_tag_protocol = dsa_loop_get_protocol,
280 .setup = dsa_loop_setup,
281 .teardown = dsa_loop_teardown,
282 .get_strings = dsa_loop_get_strings,
283 .get_ethtool_stats = dsa_loop_get_ethtool_stats,
284 .get_sset_count = dsa_loop_get_sset_count,
285 .get_ethtool_phy_stats = dsa_loop_get_ethtool_stats,
286 .phy_read = dsa_loop_phy_read,
287 .phy_write = dsa_loop_phy_write,
288 .port_bridge_join = dsa_loop_port_bridge_join,
289 .port_bridge_leave = dsa_loop_port_bridge_leave,
290 .port_stp_state_set = dsa_loop_port_stp_state_set,
291 .port_vlan_filtering = dsa_loop_port_vlan_filtering,
292 .port_vlan_add = dsa_loop_port_vlan_add,
293 .port_vlan_del = dsa_loop_port_vlan_del,
294 .port_change_mtu = dsa_loop_port_change_mtu,
295 .port_max_mtu = dsa_loop_port_max_mtu,
296};
297
298static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
299{
300 struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
301 struct dsa_loop_priv *ps;
302 struct dsa_switch *ds;
303 int ret;
304
305 if (!pdata)
306 return -ENODEV;
307
308 ds = devm_kzalloc(&mdiodev->dev, sizeof(*ds), GFP_KERNEL);
309 if (!ds)
310 return -ENOMEM;
311
312 ds->dev = &mdiodev->dev;
313 ds->num_ports = DSA_LOOP_NUM_PORTS;
314
315 ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
316 if (!ps)
317 return -ENOMEM;
318
319 ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
320 if (!ps->netdev)
321 return -EPROBE_DEFER;
322
323 pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
324
325 ds->dev = &mdiodev->dev;
326 ds->ops = &dsa_loop_driver;
327 ds->priv = ps;
328 ps->bus = mdiodev->bus;
329
330 dev_set_drvdata(&mdiodev->dev, ds);
331
332 ret = dsa_register_switch(ds);
333 if (!ret)
334 dev_info(&mdiodev->dev, "%s: 0x%0x\n",
335 pdata->name, pdata->enabled_ports);
336
337 return ret;
338}
339
340static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
341{
342 struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
343 struct dsa_loop_priv *ps;
344
345 if (!ds)
346 return;
347
348 ps = ds->priv;
349
350 dsa_unregister_switch(ds);
351 dev_put(ps->netdev);
352
353 dev_set_drvdata(&mdiodev->dev, NULL);
354}
355
356static void dsa_loop_drv_shutdown(struct mdio_device *mdiodev)
357{
358 struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
359
360 if (!ds)
361 return;
362
363 dsa_switch_shutdown(ds);
364
365 dev_set_drvdata(&mdiodev->dev, NULL);
366}
367
368static struct mdio_driver dsa_loop_drv = {
369 .mdiodrv.driver = {
370 .name = "dsa-loop",
371 },
372 .probe = dsa_loop_drv_probe,
373 .remove = dsa_loop_drv_remove,
374 .shutdown = dsa_loop_drv_shutdown,
375};
376
377#define NUM_FIXED_PHYS (DSA_LOOP_NUM_PORTS - 2)
378
379static int __init dsa_loop_init(void)
380{
381 struct fixed_phy_status status = {
382 .link = 1,
383 .speed = SPEED_100,
384 .duplex = DUPLEX_FULL,
385 };
386 unsigned int i;
387
388 for (i = 0; i < NUM_FIXED_PHYS; i++)
389 phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL);
390
391 return mdio_driver_register(&dsa_loop_drv);
392}
393module_init(dsa_loop_init);
394
395static void __exit dsa_loop_exit(void)
396{
397 unsigned int i;
398
399 mdio_driver_unregister(&dsa_loop_drv);
400 for (i = 0; i < NUM_FIXED_PHYS; i++)
401 if (!IS_ERR(phydevs[i]))
402 fixed_phy_unregister(phydevs[i]);
403}
404module_exit(dsa_loop_exit);
405
406MODULE_SOFTDEP("pre: dsa_loop_bdinfo");
407MODULE_LICENSE("GPL");
408MODULE_AUTHOR("Florian Fainelli");
409MODULE_DESCRIPTION("DSA loopback driver");
410
